Interpretive Summary: This is a Germplasm Release, no Interpretive Summary Required.

Technical Abstract:
Powdery mildew of sugarbeet was introduced into N. America in about 1974. Since, it has been a constant problem in sugarbeet production requiring chemical control. Partially resistant breeding lines and cultivars have been developed based upon quantitatively inherited slow-mildewing resistance. High resistance has been unknown in sugarbeet. High resistance was identified, however, in wild beet accessions WB97 and WB242 at Salinas. This high resistance has been partially introgressed into sugarbeet. These powdery mildew resistant enhanced breeding lines were the sources for materials to investigate the inheritance of this resistance. Field studies in 1997 and 1999 using testcross families indicated that resistance was inherited in the manner of a single dominant major gene. The gene symbol Pm has been assigned. Lines CP01 and CP02 make this resistance available to other breeders and researchers.